The Centroid is the equivalent of "hello world" in any dynamic geometry application. Look: it works! Drag the vertices of the triangle about---the three medians (which connect midpoints to opposite vertices) always concur in a point.
The future release of JavaSketchpad will include numeric measurements, which will allow one to verify that the point of concurrency (the centroid) divides each median into a 1:2 ratio.
Go back to the JavaSketchpad demo gallery.
This page was created in part by the DR1 release of JavaSketchpad, a prototype component of The Geometer's Sketchpad. Copyright ©1990-1997 by Key Curriculum Press, Inc. All rights reserved. Portions of this work are being funded by the National Science Foundation (award DMI-9561674 ).